Hello, does anyone know why 2 of my four SATA ports on my ASUS P4C800 DELUXE MOBO don't work. The top 2 work fine with a HDD and a DVD Burner attached, but when I added a second SATA burner to the third or fourth connector on the MOBO, it doesn't even recognize the device. Are these 2 reserved for some other special purpose, or do I have to do something to the MOBO to fix the problem. Thanks for your time and any help.